void SPI_SlaveInit(void)
{
	/* Set MISO output, all others input */
	DDRB = (1<<DDB4);
	/* Enable SPI */
	SPCR = (1<<SPE);
}
char SPI_SlaveReceive(void)
{
	/* Wait for reception complete */
	while(!(SPSR & (1<<SPIF)));
	/* Return Data Register */
	return SPDR;
}